package com.webserver.http;

import javax.activation.MimetypesFileTypeMap;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class HttpServletResponse {
    private static MimetypesFileTypeMap mft = new MimetypesFileTypeMap();
    private Socket socket;

    private int statusCode = 200;
    private String statusReason = "OK";
    private File entity;

    private Map<String,String> headers = new HashMap<>();

    public HttpServletResponse(Socket socket) {
        this.socket = socket;
    }

    public void response() throws IOException {
        sendStatusLine();
        sendHeaders();
        sendContent();
    }

    private void sendStatusLine() throws IOException {
        println("HTTP/1.1 "+statusCode+" "+statusReason);
    }

    private void sendHeaders() throws IOException {
        Set<Map.Entry<String,String>> entrySet = headers.entrySet();
        for (Map.Entry<String,String> e : entrySet){
            String key = e.getKey();
            String value = e.getValue();
            println(key+": "+value);
        }
        println("");
    }

    private void sendContent() throws IOException {
        if (entity != null){
            OutputStream out = socket.getOutputStream();
            FileInputStream fis = new FileInputStream(entity);
            byte[] data = new byte[1024*10];
            int len;
            while ((len = fis.read(data)) != -1){
                out.write(data,0,len);
            }
        }
    }

    private void println(String line) throws IOException {
        OutputStream out = socket.getOutputStream();
        byte[] data = line.getBytes(StandardCharsets.ISO_8859_1);
        out.write(data);
        out.write(13);
        out.write(10);
    }

    public int getStatusCode() {
        return statusCode;
    }

    public void setStatusCode(int statusCode) {
        this.statusCode = statusCode;
    }

    public String getStatusReason() {
        return statusReason;
    }

    public void setStatusReason(String statusReason) {
        this.statusReason = statusReason;
    }

    public File getEntity() {
        return entity;
    }

    public void setEntity(File entity) {
        this.entity = entity;
        addHeader("Content-Type",mft.getContentType(entity));
        addHeader("Content-Length",entity.length()+"");
    }

    public void addHeader(String name,String value){
        headers.put(name,value);
    }

    public void sendRedirect(String uri){
        this.statusCode = 302;
        this.statusReason = "Moved Temporarily";
        addHeader("Location",uri);
    }
}
